Inside (2007)

The festive season is a time for helping strangers. Unless that stranger is Beatrice Dalle’s unhinged bogeywoman who targets Alyson Paradis’ heavily pregnant home alone wife.

Red Christmas would be a better title for this astonishing French horror, as Dalle cuts a bloody swathe across one violent Christmas Eve night. The plot is strong enough to support the jaw-dropping carnage, centering on why Dalle is actually doing all this to Paradis (sister of Vanessa).

A film that puts the X into Xmas.